Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 273 (EMISSION SYSTEM)EGR VALVE INSPECTIONEGR CONTROL INSPECTIONUSING WDS OR EQUIVALENT

2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2

Using WDS or equivalent

2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Using WDS or equivalent

WARNING: This page is about a different car, the 2004 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

Connect the WDS or equivalent to the DLC-2.

Fig 1: Locating Data Link Connector (DLC-2)
Courtesy of MAZDA MOTORS CORP.
Start the engine.
Using the "SEGRP" simulation function, operate with Steps 0 (idling) to 52 and verify that the engine speed becomes unstable or the engine stalls.
- If the engine speed does not change, perform the following procedure:
  1. Stop the engine.
  2. Remove the EGR valve. (See EGR VALVE REMOVAL/INSTALLATION .)
  3. Connect the EGR valve connector.
  4. Turn the ignition switch to the ON position.
  5. Using the "SEGRP" simulation function, verify that it operates with Steps 0 (idling) to 52.
    - If the EGR valve operates, inspect the following:
      - EGR pipe clogging
    - If the EGR valve does not operate, inspect the following:
      - PCM terminal voltage
        
        EGR valve signal
      - EGR valve (If it is stuck or not moving smoothly, replace it with a new one.)
- Warm up the engine to normal operating temperature.
- Place the vehicle on the chassis dynamometer.
- Monitor the following signals using the PID/data monitor.
  - EGR valve step number (SEGRP)
  - Engine speed (RPM)
  - Vehicle speed (VSS)
  - Throttle position (TP)
  - Engine coolant temperature (ECT)
- Verify that the EGR valve step number is 0 during idle.
- Verify that the EGR valve step number increases when the accelerator pedal is depressed to increase the vehicle speed.
  - If it does not increase, inspect the following using the PID/data monitor.
    - Vehicle speed (VSS)
    - Throttle position (TP)
    - Engine coolant temperature (ECT)
- Stop the vehicle and verify that the EGR valve step number is 0 during idle.

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.